services/provisioning-service/src/main/java/com/epam/datalab/backendapi/core/response/handlers/ComputationalCallbackHandler.java
<filename>services/provisioning-service/src/main/java/com/epam/datalab/backendapi/core/response/handlers/ComputationalCallbackHandler.java/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.epam.datalab.backendapi.core.response.handlers;

import com.epam.datalab.backendapi.core.commands.DockerAction;
import com.epam.datalab.dto.ResourceURL;
import com.epam.datalab.dto.UserInstanceStatus;
import com.epam.datalab.dto.base.computational.ComputationalBase;
import com.epam.datalab.dto.computational.ComputationalStatusDTO;
import com.epam.datalab.rest.client.RESTService;
import com.epam.datalab.rest.contracts.ApiCallbacks;
import com.fasterxml.jackson.annotation.JacksonInject;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonNode;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
import java.time.Instant;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;

@Slf4j
public class ComputationalCallbackHandler extends ResourceCallbackHandler<ComputationalStatusDTO> {
    private static final String INSTANCE_ID_FIELD = "instance_id";
    private static final String COMPUTATIONAL_ID_FIELD = "hostname";
    private static final String COMPUTATIONAL_URL_FIELD = "computational_url";

    @JsonProperty
    private final ComputationalBase<?> dto;
    private final ComputationalConfigure computationalConfigure;

    @JsonCreator
    public ComputationalCallbackHandler(@JacksonInject ComputationalConfigure computationalConfigure,
                                        @JacksonInject RESTService selfService,
                                        @JsonProperty("action") DockerAction action,
                                        @JsonProperty("uuid") String uuid,
                                        @JsonProperty("dto") ComputationalBase<?> dto) {

        super(selfService, dto.getCloudSettings().getIamUser(), uuid, action);
        this.computationalConfigure = computationalConfigure;
        this.dto = dto;
    }

    protected ComputationalBase<?> getDto() {
        return dto;
    }

    @Override
    protected String getCallbackURI() {
        return ApiCallbacks.COMPUTATIONAL + ApiCallbacks.STATUS_URI;
    }

    @Override
    protected ComputationalStatusDTO parseOutResponse(JsonNode resultNode, ComputationalStatusDTO baseStatus) {

        if (resultNode == null) {
            return baseStatus;
        }
        baseStatus.withComputationalUrl(extractUrl(resultNode));
        baseStatus.withLastActivity(Date.from(Instant.now()));

        if (DockerAction.CREATE == getAction()) {
            baseStatus
                    .withInstanceId(instanceId(resultNode.get(INSTANCE_ID_FIELD)))
                    .withComputationalId(getTextValue(resultNode.get(COMPUTATIONAL_ID_FIELD)));
            if (UserInstanceStatus.of(baseStatus.getStatus()) == UserInstanceStatus.RUNNING) {
                baseStatus.withStatus(UserInstanceStatus.CONFIGURING);
                computationalConfigure.configure(getUUID(), getDto());
            }
        }
        return baseStatus;
    }

    @Override
    protected ComputationalStatusDTO getBaseStatusDTO(UserInstanceStatus status) {
        return super.getBaseStatusDTO(status)
                .withExploratoryName(dto.getExploratoryName())
                .withComputationalName(dto.getComputationalName())
                .withProject(dto.getProject());
    }

    private String instanceId(JsonNode jsonNode) {
        if (jsonNode != null && jsonNode.isArray()) {
            return StreamSupport.stream(jsonNode.spliterator(), false)
                    .map(JsonNode::textValue)
                    .collect(Collectors.joining(";"));
        } else {
            return getTextValue(jsonNode);
        }

    }

    private List<ResourceURL> extractUrl(JsonNode resultNode) {
        final JsonNode nodeUrl = resultNode.get(COMPUTATIONAL_URL_FIELD);
        return Optional.ofNullable(nodeUrl)
                .map(this::getUrls)
                .orElse(Collections.emptyList());
    }

    private List<ResourceURL> getUrls(JsonNode nodeUrl) {
        try {
            return mapper.readValue(nodeUrl.toString(), new TypeReference<List<ResourceURL>>() {
            });
        } catch (IOException e) {
            log.warn("Cannot parse field {} for UUID {} in JSON", RESPONSE_NODE + "." + RESULT_NODE + "." +
                    COMPUTATIONAL_URL_FIELD, getUUID(), e);
        }
        return Collections.emptyList();
    }
}

